Changing font weight or color of the axis label for individual dataPoint is not possible as of now.

However, you can use stripLines to achieve the same. Please take a look at this jsfiddle, where the fontColor and fontWeight of stripLine labels are set to achieve a label as that of axis label.
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Priyanka M S
Team CanvasJS

Thanks but values are actually text not numbers so that won’t help. It did give me the idea of using striplines areas but again the start end points have to be numbers or dates. It would be nice to have a feature involving datapoints where one could use a reference number, or element number, row number to set stripline conditions instead of the actual datapoint value.